body,html
  line-height: 1
  font-weight: 200
  font-family: 'PingFang SC','STHeitiSC-Light','Helvetica-Light',arial,sans-serif

#app
  max-width: 540px
  margin: 0 auto

.clearfix
  display: inline-block
  &:after
    display: block
    content: ''
    height: 0
    line-height: 0
    clear: both
    visibility: hidden

@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5)
  .border-1px
     &:after
       -webkit-transform: scaleY(0.7)
       transform: scaleY(0.7)

@media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2)
  .border-1px
     &:after
       -webkit-transform: scaleY(0.5)
       transform: scaleY(0.5)